/Engine/Plugins/Runtime/CommonUI/Source/CommonUI/Public/Groups/CommonButtonGroupBase.h
Selects a button at a specific index in the group. Clears all selection if given an invalid index.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=BaseButtonGroup) void SelectButtonAtIndex ( int32 ButtonIndex, const bool bAllowSound )